Motor switch



D. RIHARPER.

MOTOR SWITCH- APPLICATION FILED APR-.9. 1921.

1,424,901, Patented Aug. 8, 1922.

" INVENTOR.

ATTORNEY.

UNITED STATES PATENT OFFICE.

' DOUGLAS R. HARPER, on CAMERON, TEXAS. 1-

MOTOR SWITCH.

Patented Aug. 8, 1922.

Application filed. April 9,, 1921. Serial No. 460,051.

. use in small motors.

An important object of the invention is to provide a motor switch for toy motors and the like which may be very inexpensively manufactured and which may be readily installed upon the motor.

Other objects and advantages of the in vention will become apparent throughout the course of the following description.

In the accompanying drawings, wherein for the purpose of illustration is shown a preferred embodiment of my invention and wherein like reference characters designate like parts throughout:

Figure 1 is a side elevation of my switch, the method of connecting the same with the motor being diagrammatically illustrated;

Figure 2 is a longitudinal sectional View taken through the switch;

Figure 3 is a side elevation thereof, and

Figure 1 is a plan view thereof.

Referring now more particularly to the drawings, the numeral 10 indicates a suitable support shown in the present instance as comprising a frame plate of one of the small motors sold for operating toys. These plates are usually provided with two pairs of binding posts, one pair of which, 11 and 11*, is connected with the terminals of the field coil of a motor, and the other pair, 12 and 12 of which is connected with the brushes delivering current to the armature coil.'

The numeral 13 indicates a switch which comprises a strip of insulating material such as fibre, having an aperture formed therein adapted for the reception of the binding post 11. The strip forming the handle has imbedded therein a conductor 14 extending transversely of the strip and having its ends projecting slightly beyond the sides thereof, and this conductor is adapted to form an electrical contact with the binding post 11 when the switch 13 is rotatably mounted upon the binding post. This may be accomplished by forming the pivot opening in the conductor 14 and forming openrings concentric therewith and of larger size in the switch 13 so that the conductor is exposed for engagement :by the binding nut. The strip forming the switch has likewise imbedded therein a second conductor 15 which is insulated from the conductor 14 :and electrically connected with a binding post 16 carried by the switch and screwthreaded through the contact. The strip of material forming the switch 13 is provided with an extension 13 formingan operating handle which coacts with a segment having three stop points.

As illustrated in the drawings, the binding post 11 is disposed intermediate the binding posts 12 and 12 and the conducting strip 14 is adapted to alternately engage these binding posts to cause an electrical connection between the binding post 11 and the binding posts 12 or 12 as the case may be. The conductor 15 is likewise adapted to alternately engage these binding posts when the switch is oscillated so as to alternately connect the binding post 16 with the binding posts 12 and 12, the conducting strip 15 engaging the binding post 12 when the conducting strip 14 is in engagement with the binding post 12 and vice versa. These engagements are made at the extreme throw of the switch and when the switch is in the central position or in the central stop of the segment 17, the insulating portion of the switch which lies between the contacts 1 1 and 15 is alined with the binding posts 12 and 12 and the conductors l4 and 15 are accordingly out of engagement with the binding posts. In use, the binding post 11 and the binding post 16 are employed for connecting the motor with a source of current. It will be seen that with the switch in the position shown in Figure 1, current will pass through the binding post 16, contact 15, binding post 12 to the coil of the motor field, from the coil of the motor field to the binding post 12, through the conductor 14 to the binding post 11, from the bindin post 11 to the armature winding, from t e armature winding to the binding post 11 and to the source of current, conipleting the circuit. When the switch is in the dotted position, the direction of current through the field coil is reversed and current passes from the binding post 16 to the conduc or 15-, to the binding p st 12* and to e field coil, returning through the binding post 12, conductor 14, binding post 11, the armature winding, binding post 11 to the battery or source of current, and the direction of rotation of the armature of the motor is accordingly reversed From the foregoing it is believed to be obvious that I have constructed a motor switch for the use with toy motors which may be very cheaply manufactured and very easily applied. It will furthermore be obvious that the construction of the same as hereinbefore set forth is capable of some change and modification without materially departing from the spirit of my invention, andI accordingly do not limit myself to the specific structure hereinbefore set forth except as hereinafter claimed.

\Vhat I claim is:

1. A reversing switch comprising in combination a support, a pair of contacts mounted upon the support, a third contact likewise mounted upon the support, an insulating member mounted for oscillation upon the last named contact of a conductor carried by said member and electrically connected with said last named contact and adapted to alternately engage the contacts of the pair when the member is oscillated,

a second conductor carried by said member and likewise adapted to alternately engage the cont-acts of said pair, the engagement of the second conductor with the contacts being alternated with their engagement by the first named conductor.

2. A reversing switch comprising in combination a support, a pair of contacts mounted upon the support, a third contact likewise mounted upon the support, an ins dating member mounted for oscillatimi upon the last named contact of a conductor carried by said member and electrically connected with said last named contact and adapted to alternately engage the contacts of the pair when the member is oscillated to the limits of its oscillation second c ndiutor carried by said member and likcwi. adaple .i to alternately engage the c to of Sllil pair, the engagement of ti 30nd conductor with the contacts alternated with their engagement i the his: 1 l

conductor, both of said COILT'LHTtOIE being out of engagement "with said contacts a hen said member is disposed approximately midway between its limits of swing;

In testimony whereof I hereunto aiiizc my signature.

DOUGLAS R. Hi-XRPER. 

